Put flour and cake flour, salt, sugar, and baking powder into a food processor. Pulse two or three times to blend. Add frozen lard and butter and pulse 10 more times. Add ice cold water one tablespoon at a time, pulsing once in between each tablespoon. Stop at 10 tablespoons to see if you have enough liquid. The ingredients should look crumbly, but hold together when pinched. If it doesn’t easily hold together, then add one or two more tablespoons of ice water and pulse again.